Rock-drill.



La Pc 100K DRILL. unicum! nun mln u. ma.

Patend Jan. 4, 1910. l IHREM-IEEE? 1.

l N VE NTOH louz'sf. Slearde f f /bfwof ATTURNEYS L. P. SLBADB. BOGK DRILL. nrunml 21mm :un zo. uns.

8 BHEE'IHHBBT I INI/Enron oac's 'Jlmde ATTORNEYS Patented Jan. 4, 1910.

/f//////////////////////// \\\\\\\\\\\\\\\\\\\.-RA\\\\\\\\\ QN WITNES'SES lli lili

UNITED STATES PATENT OFFICE.

LOUIS FRANKLIN BLEADE, 0F DENVER. COLOMUO. SIGNOR 0F ONLBAI'IF T0 WILLIS A. SHEBWOOD, 0l' SILVEBTON, COLORADO.

BOCKDBILL Specification of Letten Patent.

Patented Jan. 4, 1910.

Application Med June $8. 1808. Sei-tal lo. 440.412.

To all 'whom 'it may concern:

Be it known that I, Louis Fnixnmx Steine, a citizen of the United States, and a resident of Denver, in the count of Denver and State Aof Colorado, have invented a new and Improved Rock-Drill, of which the following is a full, clear, and exact description.

My invention relates to drills, my more particular purpose being to provide a type of drill especial] suitable for work in rock and similar hat substances, and possessing .a number of constructional advantages whereby its utility is greatly increased.

Reference is to be had to the accompanving drawings forming a part of this speci cation, in which similar characters of reference indicate corresponding parts in all the figures.

Fifrure 1 is a' side elevation of the drill complete, this view showing the drill bit and the earin and motor for actuatin the same, nl of t ese parts being mounte together and movable as a unit as the drill advances, the movement bein under control of the operator; Fig. 2 is a p au view of the mechanism shown in Fig. 1; Fig. 3 is a sul stautially central vertical section on the line 33 of Fig. 2, lookin in the direction of the arrow, this sectiongbeing taken through the principal portions of the drill and showing the hammer and mechanism used in immediate connection with the hammer, for actuating the same; this view further showing how all of these parts, as a unit, are ad instable by aid of a hand-operated screw and may be advanced at will as the drill bit is driven forward; Fig. 4 is an enlarged vertical section upon the line 4-4 of Fig. 3, looking in the direction of the arrow, and showing n part of the mountings for the hand -operated adjusting screw used for advancing the drill, various other parts being omitted from this view. however. for the sake of clcarncss; Fig. 5 is a section on the line l'iof Fig. 3. Fig. G is nu cnlarged section upon the line (iof Fig. 3, and Fig. is n section upon the line 7-7 of the sonic figure.

Mounted upon a tubular shaft 9 are henrin);r boxes l0. ll held together by bolts 12 and adjustable by :lid ot' these bolts. Mounted upon the box 1l is o shoe lll irnvided willi n threaded stein 14. this stem eilig litted with a nut l5. A saddle 13* of frustoconical form engages the shoe 13 and is held in p ositxon b aid of the lint 15. This saddie is revclu le about the axis of the cone fi'ustum whenever the nut 15 is loosened. The bearing boxes 10, 11 are similarly ievoluble about the tubular shaft 9 whenever the bolts l2 are loosened. These bolts are provided with nuts 16 whereby they may be loosened and tightened.

Riveted securely upon the saddle 13l is a shell 1T made of angle metal and having a cross section of the shape which may be understood from Fig. 4. This shell 17 is provided at its top with a slot 18. A slide 1t), likewise made of angle iron, partially circuniscribes the shell Il' and is provided at its bottoni with a slot 20, this slot being of proper width for the saddle 13l to extend through it. The parts being:I thus arranged, the slide 19 is movable relatively to the shell 17 and the latter is therefore essentially a. slideway.

A bearin sleeve 21 is secured rigidly within the s ell 17. Extending through this bearinl sleeve is a shaft 22, and mounted upon t e outer end of this shaft is a hand crank 23. Mounted upon the shaft 22 and revoluble therewith is a screw 24 which extends a considerable distance into the shell 17. Fitted u on this screw and movable in the general irection of the length of the shell 17 is a nut 25, this nut being provided with a nut lock 26 for holding it in position.

A cylinder 27 is mounted upon a neck 28, and extending directly from this neck is a. collar 26 which encircles the nut 25. The neck 28 extends through the upper portion of the slide 19. The cylinder 27 is provided with a head 29 and Ve.\'teudi|ig ,if through this head is an adjusting screw 30. The inner end of this screw engages a stop lute 3l. A spiral spring 32 is mounted wit iin the cylinder 27, and one end of this spring rests directly nfiiinst the stop plate.

A barre 33 is in ulincment with the c vlindcr 27. A luiminer 34 is slidn bly mounted within this barrel and is provided with n slot 35. The hummer 34 is engaged directly by the sprin" 32. Mounted above the hummer 34 is n shaft 36, and secured rigidly upon this shaft is n cani 3i. provided with u point 3S. this com mrtiully extending into the slit 35'. ns will be understood from Fig. 3. The shaft Bti turns iu hearings 2li). 40.

Mounted upon thc shaft 3G is u geur wheel lill 4l, and meshing with this gear wheel is a E pinion 42, the latter being mounted upon a shaft 43. T his shaft is mounted in hearings 44, 45, as will be understood from Fig. :2. l Mounted upon the shaft 43 is a bevel gear i 46, and meshing with the latter is a bevel i pinion 47. The bevel pinion is monntedt upon a shaft 4S, which turns in u bearing 49. j; This shaft is provided with a coupling and is turned by aid of an induction motor l. t

Mounted loosely within the front end of i the barrel 33 is n drill-holder 52, provided l with an annular shoulder 53. A drill-bit 54 l is fitted into the drill-holder.

A s iral sprin (see left of Fig. 3) encirc es the shagt 22 and is used for the purpose of cushioning the screw Q4 and parts l operated by this screw, as hereinafter described.

The operation of my device is as follows: The general adjustment of the drill relatively to the work, is made by loosening the nuts l5, 16 (see bottom of Fig. 1). 1f 1t be desired to give the drill unusual freedom of direction, the bolts 15, 16 are left loose. Power from the motor 51 is applied through the shaft 48, bevel pinion 4T, bevel gear 4G, shaft 43, pinion 42, gear 4l and shaft 3G to the cam 37. This cani turns in a clockwise direction according to Fig. 3. At each comiete revolution of the cam the point 38 orces back the hammer 34, thus compressing the spiral spring 32. The instant the hammer is released by virtue of the oint 38 clearin the slot 35, however, the orce of the spring 3:? drives the hammer 34 forward. causing it to strike the drill-holder 62 and actnate the drill-bit 54. The operator can increase or diminish the tension of the s iral spring 32 by adjusting the bolt 3l), as will be understood from Fig. 3. 'lhe force of the blow delivered to the drill-bit is proportionate to the strength of the spring 32, and is delivered directly by the action of this spring. The cam serves merely to retract tie hammer and to release it periodically. By turning the crank 23 so as to rotate the screw 24, and thus force the nut '25 forward or backward, the operator causes the slide 19 to move forward or backward, as desired. When the drill bit 54 is being pushed forward, as, for instance, when a rock is being drilled continuously, the operator forces the slide 19 forward continuously or step by step after each stroke of the drill, as he sees pro er. The spiral spring 55, by yielding sliv itl under excessive strains allows not oni t e screw 24 and nut 25, but also the sli e 19 and all workin parts carried b it., to recede. When, there ore, the work o the drill is exceptionally hard, or when the forward pro ress of the drill is hindered because of t le resistance of the material operated upon, the worst that can happen is that the spring 55 is com ressed, the slide and various parts carried t iereby simply moving backward and the stroke of the drill being therefore idle.

Having thus described my invention, I :Irlaim as new and desire to secure by Letters atent:

In a device of the class described, a slide-v 

